Menu

Sequoia Scientific

Hyper-a Hyperspectral absorption instrument

LISST-OST

Optical Sediment Trap (Patent Pending)

View Gallery

LISST-OST measures diffuse attenuation from which sinking POC and particle flux can be derived

See a list of papers published with LISST-OST data here!

The LISST-OST (Patent Pending) is designed for integration onto Argo and other robotic and autonomous profiling floats. The sensor monitors sinking particles by measuring changes in diffuse attenuation as particles settle onto a large collection window and accumulate over time. Changes in the measured attenuation can be correlated with particle flux and used as a proxy for particulate organic carbon (POC) flux. Although designed for Lagrangian floats to perform measurements when parked at 2,000 meters, the LISST-OST can also potentially be mounted on fixed platforms for long-term deployments with an optional wiper accessory to help mitigate biofouling.

More Info

• Measures diffuse optical transmission
• Off-axis optical geometry to reduce interference with settling particles
• Large optical beam cross section (approximately 5 cm at the receive window)
• Ambient light rejection through light modulation and synchronous detection
• Externally powered
• RS-232 real-time output
• Onboard temperature compensation
• Optional wiper accessory available for long-term deployments with depth rating of 30 m (standard) or 100 m (extended); ONLY recommended for use in Eulerian mode, NEVER in Lagrangian mode
• Optional data logger available: NexSens X3 (IP68 rated) or NexSens X3-SUB (depth rated to 61 m)
• Software included with the instrument for transmission measurements; does not include interpretations of attenuance flux or relationships to POC flux, which must be established by the user
• Custom cable lengths available

Sponsor

Parameters Measured
• Diffuse optical transmission at 16-bit resolution
• Diffuse attenuation

Technology
• Source wavelength: ~650 nm (Red) LED
• Large-aperture sapphire receive window

Mechanical and Electrical
• Dimensions [H x D x W]: 50.5 cm x 21.3 cm x 13.3 cm
(19.90” x 8.38″ x 5.25″)
• Weight [air / water]: 4 kg / 1.2 kg (8.8 lbs / 2.6 lbs)
• Depth rating: 2,000 m
• Sampling rate: 1 Hz
• Temperature (operating): -3 °C to 40 °C
• Temperature (storage): -20 °C to 60 °C
• Material: black anodized aluminum w/sacrificial anode protection
• External power input: 7 VDC to 25 VDC
• Current drain @ 12V: 42 mA average during sampling
• Connectors: SubConn MCBH8M, MCBH3M

Updates

Test Updates

Accessories

LISST-OST Item # and Description

Item #DescriptionThumbnail
SEQ-FP-LOSTLISST-OST - Optical Sediment Trap

LISST-OST Accessories *INCLUDED* with LISST-OST

Item #DescriptionThumbnail
SEQ-AC-LTAU-CBL02LISST-OST 2-meter integrated communication and external power USB cable.

LISST-OST Accessories *NOT INCLUDED* with LISST-OST

Item #DescriptionThumbnail
SEQ-AC-LOST-WPRLISST-OST Wiper for Eulerian (moored) deployment <100 m depth ONLY.No picture (yet!)
SEQ-AC-LTAU-ZINCLISST-Tau / -OST Replacement Zinc Anode Ass'y (2 Pack)
SEQ-AC-LTAU-ZINC10LISST-Tau / -OST Replacement Zinc Anode Ass'y (10 Pack)
SEQ-AC-LOST-YCBLL-OST Replacement 'Y' Cable Assembly

FAQ

Test

test